<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      const id = Symbol("id123");
      const num = 100;
      const user = {};
      const fn = () => {};

      console.log("hello " + id.description);
      console.log("hello " + id.toString());
      console.log("hello " + String(id));
      // console.log("hello " + id);
      console.log("hello " + num);
      console.log("hello " + {});
      console.log("hello " + fn);
    </script>
  </body>
</html>
